This is the MRB Race-tour 'FIT ALL' Lambretta ignition switch, the most advanced ignition switch ever made for Lambrettas.
 
It fits all models and series types, series 1,2,3 and other versions without carving up the headset. 
 
Can be used as a normal AC switch
Can be used as a full DC switch
Can be used as a AC and DC switch
Can be used as a AC and trickle charge DC switch for toys
In the off position the battery - if used is isolated, so no power at the headset
No machining required in non-switch headsets
Has 4 switch positions (Does not use a parking light)
 
Position 0) Off
Position 1) On, brake light, horn (toys)
Position 2) On, brake light, horn (toys) side lights
Position 3) On, brake light, horn (toys) full lights
 
Comes with spacer washers to help fitment and setting up the bezel height.
 
For WORKINGS AND FITTING OF THE SWITCH - 
http://www.mbscooters.co.uk/pages/downloads/switchfitting.pdf
 
For WIRNG DIAGRAMS FOR EITHER ALL AC OR ALL DC OR AC/DC-
http://www.mbscooters.co.uk/pages/downloads/switchdiagrams.pdf